Which innovative retail payment system did Apple introduce in 2003 that revolutionized how consumers legally purchased digital music?

The music industry has undergone dramatic changes in how consumers pay for and access music throughout history. From physical media to digital downloads to streaming services, payment systems have evolved alongside technology and consumer preferences. This trivia question explores an interesting turning point in music retail history that changed how we purchase and consume music. Test your knowledge about this significant shift in the industry!

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iTunes Store (allowing individual song purchases for $0.99)
Apple Music Pass (prepaid cards for downloading unlimited music)
iMusic Direct (subscription-based streaming service)
Apple Audio Market (blockchain-based music ownership system)